Possible Clues:

• U.S./Canada partnership
• Santa Claus-tracking org
• Org. based near Colorado Springs
• U.S.-Can. air watch
• Missile-warning org
• Air defense org
• Org. that "tracks" Santa
• Org. featured in 'WarGames'
• U.S.-Canadian air command
• Org. issuing 12/24 Twitter updates